A333506 Numbers k that divide 19^k-1.

1, 2, 3, 4, 6, 8, 9, 10, 12, 16, 18, 20, 24, 27, 30, 32, 36, 40, 42, 48, 50, 54, 60, 64, 72, 80, 81, 84, 90, 96, 100, 108, 110, 120, 126, 128, 136, 144, 150, 156, 160, 162, 168, 180, 192, 200, 210, 216, 220, 240, 243, 250, 252, 256, 270, 272, 288, 294, 300, 312, 320, 324, 330, 336

Offset: 1

Author

Seiichi Manyama, Mar 25 2020

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000

Crossrefs

Columns k=19 of A333432.

Cf. A128358, A128360, A128399.

Programs

Mathematica

Join[{1}, Select[Range[2, 336], PowerMod[19, #, #] == 1 &]] (* Amiram Eldar, May 05 2021 *)

PARI

for(k=1, 1e3, if(Mod(19, k)^k==1, print1(k", ")))